I have a collection but don't want to re-create all the entire structure.
Because I cannot filter by "multiple-reference". I am not forced to create addition collections for my "vendors" collections. And all vendors will typically contain the same information.
so my sub-category will be as follows
filtered by LOCATION reference.
IF I had the ability to MULTI-REFERENCE then I could simply have all my vendors under 1 collection VS. multi collections for each category (ie. DJS, photographers, catering, cake decorator, etc.)
See my non CMS page for just 1 of 10+ locations
You'll get the idea of how content gets filtered by LOCATION / CATEGORY / SUB CATEGORY